whittle (v.)

before vowels seism-, word-forming element meaning "earthquake," from Greek seismos "a shaking, shock; an earthquake," also "an extortion" (compare colloquial shake (someone) down), from seiein "to shake, agitate, sway; to quake, shiver" from PIE root *twei- "to agitate, shake, toss; excite; sparkle" (source also of Sanskrit tvesati "to excite; to be excited, inflame, sparkle" and words in Avestan for "fears" and "fright, danger").

"cleared land," 1620s, from Old Norse or Old Danish þveit "a clearing, meadow, paddock," literally "a cutting, cut-piece" (related to Old English þwitan "to cut, cut off;" see whittle). Always a rare word and now obsolete, but frequently encountered in place names, but "It is unclear whether the base meaning was 'something cut off, detached piece of land,' or 'something cut down, felled tree' ..." [Cambridge Dictionary of English Place-Names].